Recent content by mattu

the result quoted from the ebook was the moment of inertia about the centroidal axis, and not the product of inertia. so I'm stuck again ... If I use the equation Ixy = Ix'y' + A.dx.dy to find the product of inertia with respect to the xy axis of a whole circle, the equation becomes...

i just found the answer from an ebook to be (11/200)x(r^4) (the product moment of inertia of a quadrant about its centroidal axis) honestly what I really wanted was the final answer and not the derivation. however I still like to see the derivation of it just for curiosity. I can't manage to...

Homework Statement Find the product moment of inertia of the quadrant about the x-y axis. Circle diameter is 30mm [PLAIN]http://img132.imageshack.us/img132/2382/58644163.png Homework Equations the centroid of the quadrant is located at ( 4r/3\pi , 4r/3\pi ) and in general, Ixy = \int(x y...